Quarterly report pursuant to Section 13 or 15(d)

Fair Value Option - Gains (Losses) Relating to Assets and Liabilities (Details)

v3.8.0.1
Fair Value Option - Gains (Losses) Relating to Assets and Liabilities (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Fair Value, Option, Quantitative Disclosures [Line Items]    
Gains (losses) relating to assets and liabilities accounted for under the fair value option $ 1,577 $ 1,196
Loans reported as trading account assets    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Gains (losses) relating to assets and liabilities accounted for under the fair value option 103 150
Trading inventory – other    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Gains (losses) relating to assets and liabilities accounted for under the fair value option 595 1,151
Consumer and commercial loans    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Gains (losses) relating to assets and liabilities accounted for under the fair value option 85 24
Loans held-for-sale    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Gains (losses) relating to assets and liabilities accounted for under the fair value option 1 85
Long-term debt    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Gains (losses) relating to assets and liabilities accounted for under the fair value option 778 (199)
Other    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Gains (losses) relating to assets and liabilities accounted for under the fair value option 15 (15)
Trading Account Profits    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Gains (losses) relating to assets and liabilities accounted for under the fair value option 1,631 1,087
Trading Account Profits | Loans reported as trading account assets    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Gains (losses) relating to assets and liabilities accounted for under the fair value option 103 150
Trading Account Profits | Trading inventory – other    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Gains (losses) relating to assets and liabilities accounted for under the fair value option 595 1,151
Trading Account Profits | Consumer and commercial loans    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Gains (losses) relating to assets and liabilities accounted for under the fair value option 106 5
Trading Account Profits | Loans held-for-sale    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Gains (losses) relating to assets and liabilities accounted for under the fair value option 1 1
Trading Account Profits | Long-term debt    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Gains (losses) relating to assets and liabilities accounted for under the fair value option 819 (162)
Trading Account Profits | Other    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Gains (losses) relating to assets and liabilities accounted for under the fair value option 7 (58)
Other Income    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Gains (losses) relating to assets and liabilities accounted for under the fair value option (54) 109
Other Income | Loans reported as trading account assets    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Gains (losses) relating to assets and liabilities accounted for under the fair value option 0 0
Other Income | Trading inventory – other    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Gains (losses) relating to assets and liabilities accounted for under the fair value option 0 0
Other Income | Consumer and commercial loans    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Gains (losses) relating to assets and liabilities accounted for under the fair value option (21) 19
Other Income | Loans held-for-sale    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Gains (losses) relating to assets and liabilities accounted for under the fair value option 0 84
Other Income | Long-term debt    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Gains (losses) relating to assets and liabilities accounted for under the fair value option (41) (37)
Other Income | Other    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Gains (losses) relating to assets and liabilities accounted for under the fair value option $ 8 $ 43